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Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
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What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.The Theory of Natural...
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An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
Variation of Atmospheric Pressure01:18

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Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
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Carbon-dioxide Fixation01:28

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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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Published on: April 20, 2012

ボレアル森林の上の天然エアロゾールの高負荷.

P Tunved1, H-C Hansson, V-M Kerminen

  • 1Department of Applied Environmental Science (ITM), Air Pollution Laboratory, Frescativägen 54, SE-106 91, Stockholm, Sweden. peter.tunved@itm.su.se

Science (New York, N.Y.)
|April 15, 2006
PubMed
まとめ

欧州の北極林は,大気中のエアロゾールに大きく貢献しています. 森林の排出は気候活性粒子を作り,放射線予算の推定と気候フィードバックループに影響を与えます.

さらに関連する動画

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
13:38

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 2019

関連する実験動画

Last Updated: Jul 6, 2026

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
14:38

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

Published on: April 20, 2012

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
13:38

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Published on: October 26, 2019

科学分野:

  • 大気化学 大気化学
  • 気候科学 気候科学
  • 環境科学 環境科学

背景:

  • エアロゾールは,地球の放射線バランスに大きな影響を与えます.
  • エアロゾール源を理解することは,気候モデリングに不可欠です.
  • ヨーロッパの北極地域のエアロゾールへの寄与については,さらなる調査が必要である.

研究 の 目的:

  • 大気中のエアロゾールの質量と数の源としてヨーロッパの北極地域を調査する.
  • モノテルペンの排出量と,人為的な影響が少ない地域におけるエアロゾール形成との関係を確立する.
  • 森林によって生成される気候に関係するエアロゾール集団を定量化するために.

主な方法:

  • エアロゾールの質量および数値濃度の分析.
  • モノテルペン排出とエアロゾール形成の相関性に関する研究.
  • ヨーロッパの北極地域におけるフィールド測定.

主要な成果:

  • ヨーロッパの北極地域は,大気中のエアロゾールの実質的な源として特定されています.
  • モノテルペンの排出量とガスから粒子への変換の間に直接的な関係があることが判明しました.
  • 森林は,生長期間中に1000-2000粒/cm3の気候的に活発なサイズを生成します.

結論:

  • ボレアル森林は,気候的に重要なエアロゾールの重要な天然源です.
  • これらの発見は,大気放射線予算の計算を洗練するために非常に重要です.
  • この研究は,気候フィードバックメカニズムにおける生物学的エアロゾール排出量の重要性を強調しています.